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Phenytoin cumulation kinetics.

J P Allen, T M Ludden, S R Burrow

    Clinical Pharmacology and Therapeutics
    |October 1, 1979
    PubMed
    Summary
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    This study investigated phenytoin pharmacokinetics in male subjects. Results indicate that phenytoin elimination follows Michaelis-Menten kinetics, crucial for understanding drug accumulation and dosing.

    Area of Science:

    • Pharmacology
    • Clinical Pharmacokinetics

    Background:

    • Phenytoin is an anticonvulsant medication with a narrow therapeutic index.
    • Understanding its pharmacokinetic profile is essential for safe and effective dosing.

    Purpose of the Study:

    • To characterize the pharmacokinetic parameters of phenytoin in male subjects.
    • To evaluate the elimination kinetics of phenytoin.

    Main Methods:

    • Oral administration of phenytoin sodium to four male subjects at varying daily doses (260-600 mg).
    • Collection of daily predose blood samples for serum level determination via gas-liquid chromatography.
    • Analysis of serum concentration-time data using a one-compartment open model with zero-order input and Michaelis-Menten elimination.

    Main Results:

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    • Serum phenytoin concentrations ranged from 1 to 18 µg/ml.
    • Estimated pharmacokinetic parameters included Vmax (5.28–8.41 mg/kg/day), Km (0.83–4.18 mg/L), and Vd (0.74–0.97 L/kg).
    • These parameter estimates align with previously reported literature values.

    Conclusions:

    • The time course of phenytoin accumulation is consistent with Michaelis-Menten elimination kinetics.
    • This suggests a saturable major elimination pathway for phenytoin.